FA-82995 / Go territory scoring / Member archive

tt is treated as a pass on boards larger than 19x19 · case 05

A real move at column 20 row 20 on a 21x21 board is dropped as a pass.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [size, text]. "" is a pass; "tt" is also a pass on boards up to 19x19. Otherwise exactly two lower-case letters: first = column, second = row, both from the top-left. Return [row, col], "pass" or "invalid".

Why this case matters

Go servers and scoring tools compute this value automatically; a wrong answer changes a game result.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
sgf point case 7	`"pass"`	`[19, 19]`	Failed

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